Ni(II) immobilized on modified boehmite nanostructures: a novel, inexpensive, and highly efficient heterogeneous nanocatalyst for multicomponent domino reactions

摘要

Here we report the synthesis of Ni(II) immobilized on modified boehmite nanostructures as an environmentally friendly heterogeneous catalyst for the one-pot domino synthesis of benzo[a]pyrano[2,3-c]phenazine and benzo[a]benzo[6,7]chromeno[2,3-c]phenazine in PEG as a green solvent. Elemental analysis, FT-IR, XRD, TGA, SEM, EDX, and ICP-OEC confirmed the structure of this nanocatalyst. Importantly, this nanocatalyst can be easily separated from the reaction media and reused for at least four consecutive cycles without a discernible reduction in its catalytic activity.